For the normal linear model, explain why the expression yi = p j=1 ????jxij + ????i with

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For the normal linear model, explain why the expression yi = ∑p j=1 ????jxij + ????i with ????i ∼ N(0, ????2) is equivalent to yi ∼ N(

∑p j=1 ????jxij, ????2).

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